netdev - potential null dereference in proto

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Date:	Tue, 2 Jun 2009 11:50:52 +0300 (EAT)
From:	Dan Carpenter <error27@...il.com>
To:	netdev@...r.kernel.org
Subject: potential null dereference in proto_register()

There is a potential null dereference in proto_register() 
from net/core/sock.c

prot->rsk_prot can be null on line 2161 but we dereference it on line 
2167.

  2161  out_free_request_sock_slab:
  2162          if (prot->rsk_prot && prot->rsk_prot->slab) {
  2163                  kmem_cache_destroy(prot->rsk_prot->slab);
  2164                  prot->rsk_prot->slab = NULL;
  2165          }
  2166  out_free_request_sock_slab_name:
  2167          kfree(prot->rsk_prot->slab_name);

Found by smatch.

regards,
dan carpenter

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